复掺纳米TiO2和稻壳灰的铁尾矿砂水泥砂浆性能研究  

An experimental study on properties of iron ore sand cement mortar mixed with nano-TiO2 and rice husk ash

作　　者：韩守杰[1] 王玉雅[1] 余沛[1] 邓子琦 杨丽萍 HAN Shoujie;WANG Yuya;YU Pei;DENG Ziqi;YANG Liping(School of Civil Engineering,Shangqiu Institute of Technology,Shangqiu 476000,China;China Construction Second Engineering Bureau Ltd.,Beijing 100010,China)

机构地区：[1]商丘工学院土木工程学院,河南商丘476000 [2]中国建筑第二工程局有限公司,北京100010

出　　处：《新型建筑材料》2020年第6期22-25,29,共5页New Building Materials

基　　金：河南省高等学校重点科研项目(18A410002、18B560008)

摘　　要：以纳米TiO2和稻壳灰取代部分水泥,研究纳米TiO2对铁尾矿砂水泥砂浆强度与耐久性能的影响。试验结果表明:复掺纳米TiO2和稻壳灰可有效提高铁尾矿砂水泥砂浆的抗压和抗折强度,当纳米TiO2掺量为3%时,铁尾矿砂水泥砂浆强度达到最高;复掺20%稻壳灰和3%纳米TiO2的铁尾矿砂水泥砂浆的氯离子扩散系数最低,90 d氯离子扩散系数较基准组降低42.6%;掺入纳米TiO2和稻壳灰可明显改善铁尾矿砂水泥砂浆的抗硫酸盐侵蚀性能,在5%Na2SO4溶液中浸泡60 d后,复掺20%稻壳灰和3%纳米TiO2的铁尾矿砂水泥砂浆的质量损失率和强度损失率较基准组减小50%左右。The effects of nano-TiO2 and rice husk ash on the strength and durability of iron ore sand cement mortar were investigated in this paper by partially substituting cement with nano-TiO2 and rice husk ash.The results indicate that:the compressive strength and flexure strength of iron ore sand cement mortar can be effectively improved when mixed with nano-TiO2 and rice husk ash.Specifically,when the content of nano-TiO2 is 3%,the maximum strength of iron ore sand cement mortar occurs;the chloride ions diffusion coefficient of iron ore sand cement mortar incorporated with 20%rice husk ash and 3%nano-TiO2 reaches the minimum,and its chloride ions diffusion coefficient is 42.6%lower than that of the reference group after curing for 90 d;the addition of nano-TiO2 and rice husk ash can evidently enhance the sulfate corrosion resistance of iron ore sand cement mortar.After soaking in 5%Na2SO4 solution for 60 days,the mass loss rate and strength loss rate of iron ore sand cement mortar mixed with 20%rice husk ash and 3%nano-TiO2 are nearly 50%lower than those of the reference group.

关 键 词：纳米TIO2 稻壳灰 铁尾矿砂水泥砂浆 耐久性 

分 类 号：TU528[建筑科学—建筑技术科学]